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band-wagon Explained

band-wagon at English => English (English Etymology) Of Explained:

1855, Amer.Eng., from band (2) + wagon, originally a large wagon used to carry the band in a circus procession; as these also figured in celebrations of successful political campaigns, being on the bandwagon came to represent "attaching oneself to anything that looks likely to succeed," a usage first attested 1899 in writings of Theodore Roosevelt. ///